1 files changed, 79 insertions, 0 deletions
diff --git a/helper_test.go b/helper_test.go
new file mode 100644
index 0000000..41e6b72
--- /dev/null
+++ b/helper_test.go
@@ -0,0 +1,79 @@
+package main
+
+import (
+	"bytes"
+	"os"
+	"testing"
+)
+
+/* Helpers for writing unit tests
+ */
+
+type DummyTUN struct {
+	name    string
+	mtu     int
+	packets chan []byte
+	events  chan TUNEvent
+}
+
+func (tun *DummyTUN) File() *os.File {
+	return nil
+}
+
+func (tun *DummyTUN) Name() string {
+	return tun.name
+}
+
+func (tun *DummyTUN) MTU() (int, error) {
+	return tun.mtu, nil
+}
+
+func (tun *DummyTUN) Write(d []byte, offset int) (int, error) {
+	tun.packets <- d[offset:]
+	return len(d), nil
+}
+
+func (tun *DummyTUN) Close() error {
+	return nil
+}
+
+func (tun *DummyTUN) Events() chan TUNEvent {
+	return tun.events
+}
+
+func (tun *DummyTUN) Read(d []byte, offset int) (int, error) {
+	t := <-tun.packets
+	copy(d[offset:], t)
+	return len(t), nil
+}
+
+func CreateDummyTUN(name string) (TUNDevice, error) {
+	var dummy DummyTUN
+	dummy.mtu = 0
+	dummy.packets = make(chan []byte, 100)
+	return &dummy, nil
+}
+
+func assertNil(t *testing.T, err error) {
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func assertEqual(t *testing.T, a []byte, b []byte) {
+	if bytes.Compare(a, b) != 0 {
+		t.Fatal(a, "!=", b)
+	}
+}
+
+func randDevice(t *testing.T) *Device {
+	sk, err := newPrivateKey()
+	if err != nil {
+		t.Fatal(err)
+	}
+	tun, _ := CreateDummyTUN("dummy")
+	logger := NewLogger(LogLevelError, "")
+	device := NewDevice(tun, logger)
+	device.SetPrivateKey(sk)
+	return device
+}